This is an incomplete list of the names and nicknames of flags, organized in alphabetical order by flag name. Very few flags have any truly official names, but some unofficial names are so widely used that they are accepted as a flag's universal name.
Aappalaartoq ("The red"), Greenland
Al-Adaam ("Support flag"), Qatar
Alam Baladii ("My country's flag"), Kuwait
Alay Rengîn ("Colourful flag"), Kurdistan
Albayrak ("Red Flag"), Turkey
Alsancak ("Holy Red Standard"), Turkey
Ay Yıldız ("Crescent Star"), Turkey
La Albiceleste or La Celeste y Blanca ("The white and light blue one"), Argentina
A'najmataynee ("The Two Stars"), Syria
Bandeira Auriverde ("Gold and Green Flag"), Brazil!
Bandeira das Quinas ("Flag of the quinas", the five blue shields of the Portuguese arms), Portugal
Baner Dewi Sant ("Flag of Saint David"), Wales (unofficial flag)
Baner Peran ("St. Piran's flag"), Cornwall
Bhagwa ("The Saffron Banner"), Flag of the Hindus and former flag of the Maratha Empire
Biało-Czerwona ("White-Red"), Poland
Bieł-Čyrvona-Bieły ("White-Red-White"), historical flag of Belarus
Bindenschild, Austria
Bo Najma w Hlal ("Flag of the Star and the Crescent"), Libya
Bonnie Blue Flag, official flag of the now-defunct Republic of West Florida, also used in some places as an unofficial banner of the Confederate States of America.
Bosanski Ljiljan ("Bosnian lily"), former flag of Bosnia and Herzegovina
Bratach-Croise ("Saltire"), Scotland
The Broken Trident, Barbados
Bundesflagge ("Federal Flag"), Germany, official designation
Български трикольор/Balgarski Trikolyor ("Bulgarian Three Colors"), Bulgaria
青天、白日、滿地紅 ("Blue Sky, White Sun, Red Field") (Qīng Tiān, Bái Rì, Mǎn Dì Hóng), Republic of China (Taiwan)
La Celeste ("The light blue one"), Uruguay
Commonwealth Blue Ensign, Australia
Crois Naomh Anndra ("St. Andrew's Cross"), Scotland
Cờ đỏ sao vàng ("Red Flag and Yellow Star"), Vietnam
Crotz occitana ("Occitan cross"), Occitania
Dannebrog ' ("Danish cloth"), Denmark
Derti ("My Nation/Land"), Kuwait
Erfalasorput ("Our flag"), Greenland
La Estrella Solitaria ("The Lonely Star"), Chile,
La Estrella Solitaria ("The Lonely Star"), Cuba
Estelada blava ("Blue-Starred Flag"), Catalan separatism
Eureka Flag, Australia
Eureka Jack, Australia
Five Coloured Flag, Jain flag
Fleurdelisé ("Fleur-de-lis-y"), Quebec
Galanolefki ("Light blue and white"), Greece
Golden Arrowhead, Guyana
Gwenn-ha-du ("White and black"), Brittany
Grand Ol' Flag
Hinomaru 日の丸 ("Sun disc"), Japan (national flag and naval flag)
Hvítbláinn, a flag proposal which was used but never became official, Iceland
Ikurriña ("Flag"), Basque Country (the autonomous community, the region, and more generally the Basque people, culture and language)
Innabi ("The Maroon"), Qatar
Tiranga ("The Tricolour"), India
Bratach ("Irish tricolour"), Irland
Jalur Gemilang ("Stripes of Glory"), Malaysia
Jefferson Seal flag, Jefferson (proposed U.S. state)
Kanaka Maoli ("True People"), Hawaii (alternative flag)
Kaponga (silver fern), New Zealand (unofficial, widely used)
Khanjar Oo Sayfain ("Dagger and two swords"), Oman
Khutjvriani Drosha ("Five-cross flag"), Georgia
Kök Bayraq ("Blue Banner"), East Turkestan
Lal-Sobuj ("Red & green"), Bangladesh
Leòmhann na h-Alba ("Lion Rampant"), Scotland
Maple Leaf or l'Unifolié, Canada
Merkið ("The Banner"), Faroe Islands
Nishan Sahib ("Holy flag"/"Exalted banner"), Sikh flag
Nisshōki 日章旗 ("Sun-mark flag"), Japan
Old Glory, United States
Pahāḍa ("Mountain"), Nepal
Parcam-e-Sitarah-o-Hilal ("Flag of the Crescent and Star"), Pakistan
Prinsenvlag ("Prince's flag"), Netherlands (historical)
Piros-fehér-zöld ("Red-White-Green"), Hungary
Puli Kodi ("Tiger flag"), Tamil Eelam
Qaumi Parcham ("National flag"), Pakistan
青天、白日、滿地紅 (Qīng Tiān, Bái Rì, Mǎn Dì Hóng) ("Blue Sky, White Sun, Red Field"), Republic of China (Taiwan)
The Rainbow Flag, Unity Flag, or Interim Flag (all unofficial), South Africa
Rainbow flag, there are several independent rainbow flags in use today, the most widely known worldwide is the pride flag representing gay pride, while the peace flag is especially popular in Italy and the cooperative flag symbolizes the international co-operative movement.
Red Ensign or Red Duster, the civil ensign of the United Kingdom
Красный флаг СССР (Krasnyy flag SSSR) ("Red Flag USSR"), Soviet Union
Российский триколор (Rosiiski Trikolor) ("Russian Three Colours"), Russia
Rojigualda ("Red-weld"), Spain
Rot-Weiss-Rot ("Red-white-red"), Austria
De Roude Léiw ("Red Lion"), civil ensign of Luxembourg
Ручнік (Ručnik), Belarus
Saint Andrew's Cross or The Saltire, Scotland
Saint George's Cross, England
Saint Petroc's Flag, Devon
Sam Si ("Tricolor"), Laos
Sarkanbaltsarkanais karogs ("Red-white-red flag"), Latvia
Sang Saka Merah Putih ("The Red White"), Indonesia
Ѕвездата од Кутлеш ("Sun of Kutleš'), Republic of Macedonia (historical flag)
Schwarz-Rot-Gold ("Black-red-gold"), Germany
Seh-ye Rang-ye Beyraq ('"Tricolor"), Iran
Senyera, Alghero and Catalonia
Shir-o-Khorshid ('The lion and the sun"), Iran (historical flag)
Shqiponja Dykrenare ("The two-headed eagle"), Albania
Sinimustvalge ("Blue-black-white"), Estonia
Siniristilippu ("Blue Cross Flag"), Finland
Snow lion flag, Tibet
Southern Cross, Confederate States of America (other meanings)
Southern Cross Flag, Australia
Southern Cross Flag, New Zealand
Stars and Bars, Confederate States of America
Stars and Stripes, United States
Star-Spangled Banner, United States
Taegeukgi, South Korea
Tatlong Bituin at Isang Araw ("Three Stars and a Sun"), Philippines
Al Tawheed/Shahada, Saudi Arabia
Tirangaa ("The Tricolour"), India
Tjúgufáni, state flag of Iceland
Trairong ("Tricolour"), Thailand
Tree Cassyn Vannin ("Three Legs of Mann"), Isle of Man
Tricolor or similar, a term for several national flags which are tribands or tricolours:
La Tricolor ("The Tricolor"), Bolivia
El Tricolor Nacional ("The National Tricolor"), Colombia
La Tricolor, Costa Rica
La Tricolor, Ecuador
Tricolor Nacional ("National Tricolour"), Venezuela
La Tricolor, Second Spanish Republic (historical)
Drapeau Tricolore ("Tricolour Flag"), France
Il Tricolore, Italy
Tricolorul, Romania
Триколор (Trikolor), Russia
Trídhathach na hÉireann ("Irish tricolour"), Ireland
Trinacria, Sicily
Trispalvė, Lithuania
Üçrəngli Bayraq ("Tricolour Flag"), Azerbaijan
L'Union Fait La Force ("Unity makes strength"), motto on the flag of Haiti
Union Jack or Union Flag, United Kingdom
Union Jack, jack of the United States Navy
Wiphala, a flag representing the native peoples of the Andes and the co-official flag of Bolivia
五星红旗 (Wǔ Xīng Hóng Qí) ("Five-Starred Red Flag"), People's Republic of China
Y Ddraig Goch ("The Red Dragon"), Wales
Եռագույն (Yerakooyn) ("Tricolour"), Armenia
жовто-блакитний (прапор) (Zhovto-blakytnyy (prapor)) ("Yellow-blue (flag)"), Ukraine
List of flag names Wikipedia (Text) CC BY-SA